Pool boiling of refrigerants R-134a and R-404A on porous and structured tubes part II. Heat transfer performance

Chien Yuh Yang, Chih Feng Fan

研究成果: 雜誌貢獻期刊論文同行評審

9 引文 斯高帕斯(Scopus)

摘要

This is the second part of a two-part experimental work that is intended to provide a further understanding of the physical phenomenon for refrigerants R-134a and R-404A boiling on structured and porous tubes. This paper provides measurement results of heat transfer performance on smooth and enhanced tubes. The results show that the relation of heat transfer performance to the heat flux can be well explained by the bubble dynamics as observed in Part I of this study. The present study also supports the suggestion of Chen et al. 2002 that for tubes with surface pores or with surface pores connected by sub-surface tunnel, the high performance of structured surfaces is largely brought about by evaporation inside the tunnels. For a surface with big openings, most of heat load is transported by sensible heat, especially at a high flux.

原文???core.languages.en_GB???
頁(從 - 到)85-97
頁數13
期刊Journal of Enhanced Heat Transfer
13
發行號1
DOIs
出版狀態已出版 - 2006

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